David Grann, the author of The Lost City of Z (which my wife scooped up off the bookshelf the other day and has barely put down since), reports on some new findings that indicate that there was a large civilization that lived in the jungles of the upper Amazon basin.

The latest discovery proves that we are only at the outset of this archeological revolution — one that is exploding our perceptions about what the Amazon and the Americas looked like before the arrival of Christopher Columbus. Parssinen and the other authors of the study in Antiquity write, “This hitherto unknown people constructed earthworks of precise geometric plan connected by straight orthogonal roads… The earthworks are shaped as perfect circles, rectangles and composite figures sculpted in the clay rich soils of Amazonia.”